CHEVY LOUD KNOCKING NOISE

MY BLAZER HAD A BLOWN HEAD GASKET AND I AHD THE HEADS REPAIRD AND REPLACED BY MY HUSBAND AND THEY SAID THAT THAT THE OIL PUMP WAS GOOD IT WAS FULL OF THICK OIL ALL OVER ONCE TAKEN APART AND CLEANED OUT WITH GAS/AND KAROSEN GAS OIL DRAINED SEVERAL TIMES BEFORE DRIVING AND STILL CHANGING THE OIL SEVERAL TIMES BECAUSE OF THE CLEAN OUT IT STARTED FINE AND YES IT SMOKED BECAUSE OF THE SITTING AND GAS PURED IN IT AND RAN FINE, NOW IT IS KNOCING LOUD AND WHEN YOU PUSH THE GAS PEDAL IT CLACKS LOUDER AND WHEN YOU LET UP OFF THE PEDAL IT QUIETS DOWN AND THEN WHEN YOU TURN IT OFF IT KNOCKS RAPIDLY AND I STARTED HEARING A CLICK NOISE UNDER THE THE TRUCK ONCE IT IS RUNNING IN MY DRIVE WAY SEVERAL CLICKS IS THIS A CAM, OR LIFTER, OIL PUMP OR ENGINE GOING OUT I STILL DRIVE IT TO WORK AND I DON'T PUSH IT I DRIVE IT AS LIGHT AS I CAN I ALSO HAVE A STARTER PROBLEM ALL OF A SUDDEN TO WHERE THE STARTER KEEPS BREAKING @ THE BOLTS AND BRACKET MY HSBAND PLACED A WOOD BLOCK BETWEEN THE STATER AND MOTOR TO HEPL STAY IN PLACE CAN THEIR BE A BRACKET MADE FOR THIS CAN STOP MOVING THE STARTER FROM THE FLY WHEEL PLEASE GIVE ME SOME ANSWERS

Ok, first of all, do not run this engine. It sounds like there is no oil pressure. Never take an oil pump apart, clean it out, and then put it back in an engine. If you have oil pressure, take the valve covers off and make sure everything is adjusted right. Make sure everything is tight especialy the rockerarms. Look carefully at the valve keepers and retainers. Make sure that one of them didn't come off. Your rockerarms are self aligning make sure they are aligned properly.
Your starter problem is probably caused by the violent shaking of the motor. This shaking may be caused by no oil pressure but check this also--Check and see if the motor mounts are broken. This may be the whole problem too. If there is smoke coming out from the tail pipe then I'm afraid the end may be near for your engine. Test the compression on all of the cylinders. The compression test will tell you if the rings are worn out. If so then you must make a decision, either run it till it blows up or rebuild the motor.